#SELECTABLE:NO songs are special-use, eg. special course mixes.

Never show them in the jukebox or demonstration.

stepmania/src/ScreenJukebox.cpp

@@ -46,6 +46,9 @@ bool ScreenJukebox::SetSong()
 		if( !pSong->HasMusic() )
 			continue;	// skip
 
+		if( pSong->m_SelectionDisplay == Song::SHOW_NEVER )
+			continue;	// skip
+
 		Difficulty dc = GAMESTATE->m_PreferredDifficulty[PLAYER_1];
 		Steps* pNotes = NULL;
 		if( dc != DIFFICULTY_INVALID )